PaulJ's H4 Mongrel Build x 2
Re: PaulJ's H4 Mongrel Build x 2
@exxos , @Icky I have been scoping a lot of the signals on the H4 and find everything a lot cleaner than on the Atari boards and even the Remake board. I believe you have a real winner with this board.
Re: PaulJ's H4 Mongrel Build x 2
Re: PaulJ's H4 Mongrel Build x 2
Yes I'm not too far away, I get the double reset and garbage on the serial, so its alive, just confused, poor thing.
Not got a great deal of time at the minute though which doesn't help.
Not got a great deal of time at the minute though which doesn't help.
If it ain't broke, test it to Destruction.
Re: PaulJ's H4 Mongrel Build x 2
Glad to hear A stable foundation to build upon is what I am aiming for. I want to spend time developing add ons and upgrades, not debugging 30 year old stuff
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: PaulJ's H4 Mongrel Build x 2
That's exactly what I have in mind too @PaulJ
If it ain't broke, test it to Destruction.
Re: PaulJ's H4 Mongrel Build x 2
Understand, back when I had a day job time was much harder to come by not to mention when I traveled I had to leave all the toys at home so it was 100 percent wasted time other than the pay check.
Re: PaulJ's H4 Mongrel Build x 2
I used hot air, which I'm not really comfortable with either. I actually did successfully replace a dead SRAM chip on my Falcon that way (the success of which still surprises me) and maybe overestimated how well I could do hot air, because yeah, I ended up sitting there and just cooking things before I finally got it all to settle down, so I've been nervous about those ICs all along. (Although it seems like my reset and LS11 ICs were fine at least.PaulJ wrote: ↑Thu Dec 05, 2019 2:39 pm Like you said you may have fried the chips. Did you use hot air or soldering iron. I used a soldering iron which I'm comfortable with. I've tried hot air and have no faith in my ability to use it. Blowing the small components away or sitting there forever cooking things.
Over the course of this project, I got a camera attachment for my microscope (I swear, I'm spending more money on tools than I am the hardware I'm building!) and using that, I found it really easy to rework some of the SMT stuff by hand, but of course that won't un-cook it. Since they're available from a local supplier (and cheap!), I'm going to get ahold of some more of the selector/multiplexer chips and just replace those first, soldering by hand, and we'll see what happens from there. If necessary, I can pull the DAC off a defective Falcon board I use for various tests and whatnot.
Re: PaulJ's H4 Mongrel Build x 2
@derkom
I have tried soldering with my gas iron, its mostly how I end up doing things anyway.
I have tried soldering with my gas iron, its mostly how I end up doing things anyway.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: PaulJ's H4 Mongrel Build x 2
Things falling apart here.. My Chinese power supply I use to power the H4 is only capable of 1.8 amps even though they claim 4 amps. It appears to work, current maxes and then comes down to 1.6 amps, works for 15 seconds then voltage goes to zero and current stays where its at. Running with a standard ST supply now. I connected the ultra satan to the internal dam port and no joy so I'm taking a 19 pin connector off a old board to see if that works with the Atari cart DMA test. If we get the green pass screen I'll try the US to that connector.
Re: PaulJ's H4 Mongrel Build x 2
China - self inflicted
Would help to know if the new DMA circuit works, internal and external.
Would help to know if the new DMA circuit works, internal and external.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.